The ion that always keeps the cardiac muscle | vedclass

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(C) The correct answer is $C$. Calcium ions $(Ca^{2+})$ play a critical role in the contraction of cardiac muscle. They bind to troponin,which causes

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Calcium

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(C) The correct answer is $C$. Calcium ions $(Ca^{2+})$ play a critical role in the contraction of cardiac muscle. They bind to troponin,which causes a conformational change in the tropomyosin complex,exposing the active sites on actin filaments for myosin binding. An excess of calcium ions in the extracellular fluid can lead to a state of prolonged contraction known as calcium rigor,where the heart muscle remains in a contracted state.

Column $I$	Column $II$
$i$. Eustachian valve	$a$. Opening of pulmonary aorta
$ii$. Thebesian valve	$b$. Left atrioventricular aperture
$iii$. Mitral valve	$c$. Opening of inferior vena cava
$iv$. Semilunar valve	$d$. Opening of coronary sinus

The ion that always keeps the cardiac muscle unit in a contracting state is

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